code: def test_getting_output_from_pickle_file(self):
      a, b = 2, 0  # arguments for _test_function
      pickle_fn_file = FunctionPickler.pickle_fn_and_save(
          TestFunctionPickler._test_function, "", "", a, b
      )
      fn, args, kwargs = FunctionPickler.get_fn_output(pickle_fn_file)
      self.assertEqual(fn, TestFunctionPickler._test_function)
      self.assertEqual(len(args), 2)
      self.assertEqual(len(kwargs), 0)
      self.assertEqual(args[0], a)
      self.assertEqual(args[1], b)
      self.assertEqual(fn(*args, **kwargs), 4)
      os.remove(pickle_fn_file)
  
file_path: spark/python/pyspark/ml/tests/test_dl_util.py
imports: from contextlib import contextmanager
  import os
  import textwrap
  from typing import Any, BinaryIO, Callable, Iterator
  import unittest
  from parameterized import parameterized
  from pyspark import cloudpickle
  from pyspark.ml.dl_util import FunctionPickler
label_desc: Use image node_id 4 for calling the TestFunctionPickler obj's underlying member method code with example usage: obj.test_getting_output_from_pickle_file() without return types